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Negative Linear Compressibility and Massive Anisotropic Thermal Expansion in Methanol Monohydrate

Fortes, AD; Suard, E; Knight, KS; (2011) Negative Linear Compressibility and Massive Anisotropic Thermal Expansion in Methanol Monohydrate. SCIENCE , 331 (6018) 742 - 746. 10.1126/science.1198640.

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Abstract

The vast majority of materials shrink in all directions when hydrostatically compressed; exceptions include certain metallic or polymer foam structures, which may exhibit negative linear compressibility (NLC) (that is, they expand in one or more directions under hydrostatic compression). Materials that exhibit this property at the molecular level-crystalline solids with intrinsic NLC-are extremely uncommon. With the use of neutron powder diffraction, we have discovered and characterized both NLC and extremely anisotropic thermal expansion, including negative thermal expansion (NTE) along the NLC axis, in a simple molecular crystal (the deuterated 1:1 compound of methanol and water). Apically linked rhombuses, which are formed by the bridging of hydroxyl-water chains with methyl groups, extend along the axis of NLC/NTE and lead to the observed behavior.

Type:Article
Title:Negative Linear Compressibility and Massive Anisotropic Thermal Expansion in Methanol Monohydrate
DOI:10.1126/science.1198640
Keywords:NEUTRON-DIFFRACTION, CRYSTAL-STRUCTURE, D2O ICE, INTERSTELLAR, CONSTANTS
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Earth Sciences

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